| 摘要 |
The travelling-wave Mach-Zehnder electro-optic modulator (10) has an electrical modulation electrode structure (26, 34) which constitutes a coplanar waveguide (24). An electrical input signal connector (80) is coupled to a microstrip line (38) having an output impedance which is significantly different from the input impedance of the waveguide (24). A Chebuyshev impedance matching transformer (50) couples the input signal from the input connector (80) to the modulation electrode structure (26, 34), while matching the output impedance of the microstrip line (38) to the input impedance of the waveguide (24). The modulator (10) is mounted on a block (70) of magnetically loaded epoxide material which absorbs spurious resonant microwave emissions, and enables the modulator (10) to operate with smooth frequency response over a wide range of microwave input frequencies.
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